Constant Power Soft Transmission Beam Pumping Unit

Abstract

A constant power soft transmission beam pumping unit, which is composed of a beam pumping unit, a rod pump and a constant power output AC induction motor equipped with a bell-shaped large moment of inertia energy storage flywheel for pumping units . The special constant power motor can highly adapt to the severe pulsating torque load of the beam pumping unit under a small current, and can maintain a power factor equal to about 0.9 under the super large slip rate of S equal to 20%, which can control the oil pumping. The machine performs high torque constant power dragging. The bell-shaped large moment of inertia energy storage flywheel can release the torque of about 1.5 times the average operating torque of the constant power motor in the peak range of the pulsating torque on the upstroke of the pumping unit, and drag through the pulsating peak together. It can also absorb the inertial kinetic energy released by the heavy-duty transmission system of the pumping unit and the torque energy when the constant power motor speeds up in the low torque range, so that the whole system can run under a relatively smooth load and can completely eliminate serious waste The pumping unit with electric energy reverses the phenomenon of pulling the motor.

Description

technical field [0001] The invention relates to a beam pumping unit used for oil production in an oil field and its transmission technology, in particular to a constant power soft transmission beam pumping unit which can highly adapt to the severe pulsating torque load characteristics of the existing beam pumping unit. Background technique [0002] The beam pumping unit has the advantages of simple structure, low price, and low maintenance cost. It has been widely used in oil fields at home and abroad for half a century. However, it also has serious disadvantages. The pumping unit is a device that starts with a heavy load and operates with a light load for a long time, and belongs to the output characteristics of an AC torque motor. If the excess slip power is converted into heat energy and then dissipated to achieve the required torque characteristics, because the resistance of the rotor circuit is very large, it will generate a lot of heat, which forces the design of the A...

AI Technical Summary

Problems solved by technology

[0004] When the AC induction motor is running at zero load or close to zero load, not only the AC induction motor consumes power in vain, but also the power supply equipment such as transformers for oil wells powered by a single machine also consumes power in vain.

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